如何：使用 EntityCommand 执行参数化存储过程 (EntityClient)

本主题提供的示例演示如何使用 EntityCommand 执行参数化存储过程。此示例使用如何：使用存储过程定义模型（实体框架）中实现的存储过程和数据模型。有关配置项目的信息以及如何使用对象服务执行存储过程的示例，请参见如何：使用存储过程执行查询（实体框架）。

示例

下面的代码运行一个参数化存储过程，其中的 SalesOrderHeaderId 为必需的参数。然后由 EntityDataReader 读取结果。

Using conn As EntityConnection = New EntityConnection("name=AdventureWorksEntities")
    conn.Open()

    Try

        ' Create an EntityCommand.
        Using cmd As EntityCommand = conn.CreateCommand()
            cmd.CommandText = "AdventureWorksEntities.GetOrderDetails"
            cmd.CommandType = CommandType.StoredProcedure
            Dim param As New EntityParameter()
            param.Value = "43659"
            param.ParameterName = "SalesOrderHeaderId"
            cmd.Parameters.Add(param)

            Using rdr As EntityDataReader = cmd.ExecuteReader(CommandBehavior.SequentialAccess)
                Do While rdr.Read
                    ' Read the results returned by the stored procedure.
                    Console.WriteLine("Header#: {0} " & _
                    "Order#: {1} ProductID: {2} Quantity: {3} Price: {4}", _
                    rdr.Item(0), rdr.Item(1), rdr.Item(2), rdr.Item(3), rdr.Item(4))
                Loop
            End Using
        End Using
    Catch ex As EntityException
        Console.WriteLine(ex.ToString())
    End Try
    conn.Close()
End Using

using (EntityConnection conn =
    new EntityConnection("name=AdventureWorksEntities"))
{
    conn.Open();
    try
    {
        // Create an EntityCommand.
        using (EntityCommand cmd = conn.CreateCommand())
        {
            cmd.CommandText = "AdventureWorksEntities.GetOrderDetails";
            cmd.CommandType = CommandType.StoredProcedure;
            EntityParameter param = new EntityParameter();
            param.Value = "43659";
            param.ParameterName = "SalesOrderHeaderId";
            cmd.Parameters.Add(param);

            // Execute the command.
            using (EntityDataReader rdr =
                cmd.ExecuteReader(CommandBehavior.SequentialAccess))
            {
                // Read the results returned by the stored procedure.
                while (rdr.Read())
                {
                    Console.WriteLine("Header#: {0} " +
                    "Order#: {1} ProductID: {2} Quantity: {3} Price: {4}",
                    rdr[0], rdr[1], rdr[2], rdr[3], rdr[4]);
                }
            }
        }
    }
    catch (EntityException ex)
    {
        Console.WriteLine(ex.ToString());
    }
    conn.Close();
}

另请参见

其他资源

使用 EntityClient（实体框架任务）